|
|
|
|
|
|
|
1. V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) |
FDD
Floppy Disk Drive
|
2. V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) |
FDD
Frequency Division Duplex (mobile-systems)
|
3. The Free On-line Dictionary of Computing (30 December 2018) |
disk drive
FDD
floppy disk drive
floppy drive
(Or "hard disk drive", "hard drive",
"floppy disk drive", "floppy drive") A peripheral device
that reads and writes hard disks or floppy disks. The
drive contains a motor to rotate the disk at a constant rate
and one or more read/write heads which are positioned over the
desired track by a servo mechanism. It also contains the
electronics to amplify the signals from the heads to normal
digital logic levels and vice versa.
In order for a disk drive to start to read or write a given
location a read/write head must be positioned radially over
the right track and rotationally over the start of the right
sector.
Radial motion is known as "seeking" and it is this which
causes most of the intermittent noise heard during disk
activity. There is usually one head for each disk surface and
all heads move together. The set of locations which are
accessible with the heads in a given radial position are known
as a "cylinder". The "seek time" is the time taken to
seek to a different cylinder.
The disk is constantly rotating (except for some floppy disk
drives where the motor is switched off between accesses to
reduce wear and power consumption) so positioning the heads
over the right sector is simply a matter of waiting until it
arrives under the head. With a single set of heads this
"rotational latency" will be on average half a revolution
but some big drives have multiple sets of heads spaced at
equal angles around the disk.
If seeking and rotation are independent, access time is seek
time + rotational latency. When accessing multiple tracks
sequentially, data is sometimes arranged so that by the time
the seek from one track to the next has finished, the disk has
rotated just enough to begin accessing the next track.
See also sector interleave.
Early disk drives had a capacity of a few megabytes and were
housed inside a separate cabinet the size of a washing
machine. Over a few decades they shrunk to fit a terabyte
or more in a box the size of a paperback book.
The disks may be removable disks; floppy disks always are,
removable hard disks were common on mainframes and
minicomputers but less so on microcomputers until the mid
1990s(?) with products like the Zip Drive.
A CD-ROM drive is not usually referred to as a disk drive.
Two common interfaces for disk drives (and other devices) are
SCSI and IDE. ST-506 used to be common in
microcomputers (in the 1980s?).
(1997-04-15)
|
|
|
|
|
Common Misspellings > |
fdd dfdd dfd fdfd dd ffdd fddd fd fddd fddd fd fddd edd fedd efdd rdd frdd rfdd tdd ftdd tfdd ddd fddd dfdd gdd fgdd gfdd cdd fcdd cfdd vdd fvdd vfdd bdd fbdd bfdd dd f dd fdd fwd fdwd fwdd fed fded fedd frd fdrd frdd fsd fdsd fsdd ffd fdfd ffdd fxd fdxd fxdd fcd fdcd fcdd fvd fdvd fvdd f d fd d f dd fdw fddw fdwd fde fdde fded fdr fddr fdrd fds fdds fdsd fdf fddf fdfd fdx fddx fdxd fdc fddc fdcd fdv fddv fdvd fd fdd fd d Definition commonly spelled as: Defanition or Defenition, Synonym as: Synonim, Sinonym or Sinonim, Thesaurus as: Thesorus or Thesauris, Dictionary as: Dictionery or Dictionry and Define is usually not misspelled. What does mispell meen? It Meens...
Full Map Index: Å Norway-Am Timan Chad |
Ama United States of America-Audon France |
Audouville-la-Hubert France-Baskil Turkey |
Baskin United States of America-Bindoy Philippines |
Bindoy Philippines-Breuilpont France |
Breukelen Netherlands-Campofelice di Fitalia Italy |
Campofelice di Roccella Italy-Champigny France |
Champigny-en-Beauce France-Colle San Magno Italy |
Colle Sannita Italy-Damulog Philippines |
Damurhuda Bangladesh-Duliāgaon India |
Duliajan No.1 India-Ethridge United States of America |
Étienville France-Frignano Italy |
Frignicourt France-Gouhenans France |
Gouillons France-Hasselbach Germany |
Hasselbach Germany-Hurlock United States of America |
Huron United States of America-Jovellanos Cuba |
Jovellar Philippines-Kirchzell Germany |
Kircubbin United Kingdom-La Gomera Guatemala |
La Gonfrière France-Le Hohwald France |
Le Hommet-dArthenay France-Loma de Gato Philippines |
Loma de Juárez Mexico-Mālpur India |
Mālpura India-Memphis United States of America |
Memphis United States of America-Montería Colombia |
Monteriggioni Italy-Navalilla Spain |
Navalmanzano Spain-Noyelles-lès-Seclin France |
Noyelles-lès-Vermelles France-Pachelma Russia |
Pachgaon India-Piégut-Pluviers France |
Piekary Śląskie Poland-Prilep Macedonia |
Přílepy Czech Republic-Reuil-en-Brie France |
Reuilly France-Şag Romania |
Şag Romania-Saint-Puy France |
Saint-Python France-Santa Rita Panama |
Santa Rita Venezuela-Sewarhi India |
Sewen France-Sparbu Norway |
Spardorf Germany-Tamparan Philippines |
Tampayan Philippines-Tottington United Kingdom |
Tottleben Germany-Valdivia Chile |
Valdivia Colombia-Villeneuve-le-Roi France |
Villeneuve-lès-Avignon France-White City United States of America |
White City Canada-Żywiec Poland |
|
Most Popular Searches: Define Misanthrope, Define Pulchritudinous, Define Happy, Define Veracity, Define Cornucopia, Define Almuerzo, Define Atresic, Define URL, Definitions Of Words, Definition Of Get Up, Definition Of Quid Pro Quo, Definition Of Irreconcilable Differences, Definition Of Word, Synonyms of Repetitive, Synonym Dictionary, Synonym Antonyms. See our main index and map index for more details.
|
©2011-2024 ZebraWords.com - Define Yourself - The Search for Meanings and Meaning Means I Mean. All content subject to terms and conditions as set out here. Contact Us, peruse our Privacy Policy |
|